Piston



B. CONE S Oct. 8, 1946.

PISTON Original Filed June 24, 1943 Ben C- ones Patented Oct. 8, 1946UNITED STATES PATENT OFFICE PISTON Ben Cones, Indianapolis, Ind.

1 Claim. 1

This invention relates to air motors and more particularly to a pistonconstruction, the subject matter being a division of copendingapplication Serial No. 492,099, filed June 24, 1943, and pategited underPatent No. 2,379,683, issued July 3, 1 45.

An important object of the invention is to provide a special pistonconstruction provided with a sealing factor capable of offeringconsiderably more sealing effect than is possible with most knownstructures of this character.

Other objects and advantages of the invention shall become apparent tothe reader of the following description.

In the drawing- Figure l is a fragmentary vertical sectional view.

Figure 2 is a horizontal section taken on line 2-2 of Figure 1.

Referring now to the drawing in detail wherein for the purposes ofillustration I have disclosed a preferred embodiment of my invention,the numeral 5 designates a base having a threaded tap 6 adapted forattaching an air line thereto. An outer cylinder 1 rises from the basewhich is open at its top and in which an inner cylinder 8 or piston isarranged for working movement. The inner cylinder is open at its bottomand closed at its top as shown at 9. A felt packing ring 19 ispositioned on the upper edge of the outer cyl inder l and a ring II issecured to the top 9 and projects beyond the walls of the inner cylinderto strike the felt ring I0.

A pair of .coil springs I2 connects the base 5 with the top 9 to retractthe inner cylinder.

A flexible sealing ring I3 is secured to the inner wall of the innercylinder adjacent its lower edge by rivets l5 and projects below thelower edge of the inner cylinder. The ring 13 may be constructed of anysuitable material which is impervious to moisture and oil and heatresistant. An expansible spring steel ring [4 is positioned within thesealing ring and is flared at its lower edge and scalloped to producefingers l9 adapted to expand under the influence of air pressureentering the cylinder to compress the sealing ring l3 against the innerwalls of the outer cylinder.

A lower threaded tap I1 is formed in a block l8 secured to the outerwall of the outer cylinder and which communicates with the interiorthereof for attaching an exhaust pipe and a second threaded tap I9 isalso formed in the block and likewise communicates with the outercylinder above the tap l1.

A connecting rod 20 is threaded into the top 9 and extends through thetop 9 into the inner cylinder with a nut 2| on its inner end adapted toengage a cross bar 22 secured on the upper ends of studs 23 rising fromthe base 5 .to limit outward movement of the inner cylinder. The rod 29may be connected to a lever, valve, damper or other mechanism to beoperated by the air motor.

The air outlets I! and I9 may be connected to auxiliary motors or Valves(not shown) to utilize the exhausted air for operating the same.

The several elements forming the invention may be assembled in anypracticable manner, as for instance, first attaching the studs 23 andcross-bar 22 to the base 5, then inserting the rod 29 through the top 9of the piston 8 and downwardly through the cross-bar 22 and the nut 2|may then be attached to the lower end of the rod 20 While the piston isheld upwardly away from the base." The upper ends of the springs 12 areattached to the underside of the top 9 of the piston 3 before the pistonis placed over the studs 23, and after the rod 20 has been secured inposition, the piston may be held upwardly above the base a sufiicientdistance to prevent a persons hand to grasp the lower edge of the springand pull the same downwardly for hooking the lower ends of the springsin the screw-eyes carried by the base.

The cylinder 1 is then placed over the piston and threaded on the base,after which the ring I l is secured on top of the piston.

It is believed the details of construction, operation and manner of useof the device will be readily understood from the foregoing withoutfurther detailed explanation.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, sizeand materials may be resorted to without departing from the spirit andscope of the invention as claimed hereinafter.

Having described the claimed as new is:

In a piston construction including a skirt portion adapted for workingin a cylinder, a sealing ring secured to the inner lower edge of theskirt of the piston and projecting below the lower edge of the piston, aclamping ring positioned within the sealing ring, and spring fingers onthe lower edge of the clamping ring and responsive to internal pressurein the piston to expand the lower edge of the sealing ring against thewall of the cylinder.

invention, what is BEN CONES.

